Nitrate concentration in water samples					
A	B	C	D	E	
0.01	0.16	0.12	0.06	0.03	
0.02	0.18	0.13	0.06	0.04	
0	0.17	0.15	0.05	0.03	
0.01	0.15	0.11	0.07	0.02	
0.01	0.19	0.12	0.06	0.05	
0.02	0.2	0.12	0.04	0.03	
0.01	0.25	0.09	0.05	0.03	
0	0.21	0.14	0.06	0.04	
0.02	0.16	0.13	0.05	0.04	
0.01	0.16	0.13	0.06	0.03	

					
Organic matter content in water samples 					
					
Suspended solids (dried filtrate - contains organic + inorganic material) / gm3					
A	B	C	D	E	
8	24	19	15	8	
10	20	20	16	8	
6	27	18	15	9	
7	25	18	15	11	
9	30	19	17	8	
10	29	21	14	10	
11	22	17	18	9	
8	23	20	16	9	
7	25	19	16	7	
7	26	19	16	8	
					
Suspended solids following 3 hours at 285oC "(which burns off organic matter) gm3					
A	B	C	D	E	
4	8	7	6	4	
4	7	8	7	5	
3	9	9	7	5	
2	9	8	6	6	
3	12	8	5	3	
3	10	7	8	4	
3	6	6	4	4	
2	6	8	6	5	
4	7	8	6	5	
3	10	7	6	4	
					
Dissolved oxygen content in water samples 					
A	B	C	D	E	
35	15	18	22	28	
37	16	19	23	29	
34	16	17	23	29	
36	17	17	21	27	
36	14	16	25	30	
37	15	18	24	30	
38	15	15	21	29	
35	15	17	24	28	
37	16	17	23	28	
37	17	18	25	29	

Dissolved oxygen content in water samples after dilution with set volume of aerated water.					
A	B	C	D	E	
43.5	41.5	41.8	42.2	42.8	
43.7	41.6	41.9	42.3	42.9	
43.4	41.6	41.7	42.3	42.9	
43.6	41.7	41.7	42.1	42.7	
43.6	41.4	41.6	42.5	43	
43.7	41.5	41.8	42.4	43	
43.8	41.5	41.8	42.1	42.9	
43.5	41.5	41.7	42.4	42.8	
43.7	41.6	41.7	42.3	42.8	
43.7	41.47	41.8	42.5	42.9	

Dissolved oxygen content in diluted water samples after five days incubation in the dark 					
A	B	C	D	E	
42	21	22	30	37	
41	22	23	29	38	
43	22	23	28	39	
40	23	22	31	36	
41	20	24	31	36	
42	19	22	30	37	
42	22	21	28	38	
42	20	25	29	35	
43	20	23	30	37	
41	21	24	30	37	
					
Turbidity					
A	B	C	D	E	
Still Visible at bottom	7	8	38	Still Visible at bottom	
Still Visible at bottom	8	9	45	Still Visible at bottom	
Still Visible at bottom	5	9	32	Still Visible at bottom	
Still Visible at bottom	6	10	47	Still Visible at bottom	
Still Visible at bottom	6	8	41	Still Visible at bottom	
Still Visible at bottom	5	7	39	Still Visible at bottom	
Still Visible at bottom	8	7	38	Still Visible at bottom	
Still Visible at bottom	10	10	36	Still Visible at bottom	
Still Visible at bottom	8	8	40	Still Visible at bottom	
Still Visible at bottom	8	9	40	Still Visible at bottom	
					
Abundance of mayfly larvae in water samples					
A	B	C	D	E	
28	0	0	3	9	
31	0	0	4	9	
25	0	0	5	11	
33	0	0	5	10	
29	0	0	7	12	
28	0	0	6	9	
29	0	0	5	8	
27	0	0	3	11	
30	0	0	6	10	
32	0	0	6		
Abundance of Tubifex worms in water samples					
A	B	C	D	E	
0	9	10	0	0	
0	8	11	1	0	
0	9	9	1	0	
0	10	10	0	0	
0	7	11	0	0	
0	11	12	0	0	
0	9	12	2	0	
0	9	9	0	0	
0	8	13	1	0	
0	13	11	0	0